Scilab Function
Last update : April 1993

zpell - lowpass elliptic filter

### Calling Sequence

  `[zeros,poles,gain]=zpell(epsilon,A,omegac,omegar)`

### Parameters

- `epsilon`: real : ripple of filter in pass band (`0<epsilon<1`)
- `A`: real : attenuation of filter in stop band (`A>1`)
- `omegac`: real : pass band cut-off frequency in Hertz
- `omegar`: real : stop band cut-off frequency in Hertz
- `zeros`: resulting zeros of filter
- `poles`: resulting poles of filter
- `gain`: resulting gain of filter

### Description

Poles and zeros of prototype lowpass elliptic filter. `gain` is the gain of the filter

### See Also

`ell1mag`, `eqiir`,

### Author

F.D.